When I start RAServer (as an application), I get the log file bellow. I
double checked that the plugin "org.apache.jakarta_commons_logging_1.0.3"
exists in the <unzip_directory>\plugins, so I don't figure out what I
missed...

Hi Sebastien,
This warning message indicates that the
org.apache.jakarta_commons_logging_1.0.3 plugin does not have an Agent
Controller configuration. This is common if a plugin does not require other
plugins packaged with the Agent Controller and/or if the plugin does not
provide an application to be executed by clients via the Agent Controller.
This is the case for the org.apache.jakarta_commons_logging_1.0.3 plugin.
This warning message may be ignored.

First, thank you for your precious help.
The problem here is : how to know which issues to ignore or merely which
one must be resolved ? I first ignored all these messages, but when
trying to perform "An Introduction to Using TPTP's Automated GUI
Recorder", I got stucked in section 2.2.3 (trying to launch the recorded
suite in standard mode), with the following error message in the
RAServer console. The launcher seemed to stall at 60%, overwhelming my
cpu...Did you already face this problem as well ?